Tue, 07 Jul 2009 14:23:00 -0400
6855834: G1: minimize the output when -XX:+PrintHeapAtGC is set
Summary: Changing the behavior of -XX:+PrintHeapAtGC for G1 from printing lengthy, per-region information to instead printing a concise summary.
Reviewed-by: ysr, apetrusenko, jcoomes
1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // Mutexes used in the VM.
27 extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code
28 extern Monitor* SystemDictionary_lock; // a lock on the system dictonary
29 extern Mutex* PackageTable_lock; // a lock on the class loader package table
30 extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access
31 extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer
32 extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment
33 extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles
34 extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list
35 extern Mutex* JNICachedItableIndex_lock; // a lock on caching an itable index during JNI invoke
36 extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers
37 extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers
38 extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in
39 extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data
40 extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list
41 extern Monitor* Heap_lock; // a lock on the heap
42 extern Mutex* ExpandHeap_lock; // a lock on expanding the heap
43 extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary
44 extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary
45 extern Mutex* VtableStubs_lock; // a lock on the VtableStubs
46 extern Mutex* SymbolTable_lock; // a lock on the symbol table
47 extern Mutex* StringTable_lock; // a lock on the interned string table
48 extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx
49 extern Mutex* MethodData_lock; // a lock on installation of method data
50 extern Mutex* RetData_lock; // a lock on installation of RetData inside method data
51 extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table
52 extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute
53 extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate
54 extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction
55 extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads
56 // (also used by Safepoints too to block threads creation/destruction)
57 extern Monitor* CGC_lock; // used for coordination between
58 // fore- & background GC threads.
59 extern Mutex* STS_init_lock; // coordinate initialization of SuspendibleThreadSets.
60 extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL
61 extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification
62 extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc
63 extern Monitor* CMark_lock; // used for concurrent mark thread coordination
64 extern Monitor* ZF_mon; // used for G1 conc zero-fill.
65 extern Monitor* Cleanup_mon; // used for G1 conc cleanup.
66 extern Mutex* SATB_Q_FL_lock; // Protects SATB Q
67 // buffer free list.
68 extern Monitor* SATB_Q_CBL_mon; // Protects SATB Q
69 // completed buffer queue.
70 extern Mutex* Shared_SATB_Q_lock; // Lock protecting SATB
71 // queue shared by
72 // non-Java threads.
74 extern Mutex* DirtyCardQ_FL_lock; // Protects dirty card Q
75 // buffer free list.
76 extern Monitor* DirtyCardQ_CBL_mon; // Protects dirty card Q
77 // completed buffer queue.
78 extern Mutex* Shared_DirtyCardQ_lock; // Lock protecting dirty card
79 // queue shared by
80 // non-Java threads.
81 // (see option ExplicitGCInvokesConcurrent)
82 extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops.
83 extern Mutex* EvacFailureStack_lock; // guards the evac failure scan stack
84 extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc)
85 extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued
86 #ifdef TIERED
87 extern Monitor* C1_lock; // a lock to ensure on single c1 compile is ever active
88 #endif // TIERED
89 extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization
90 extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated
91 extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics
92 extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays
93 extern Monitor* Terminator_lock; // a lock used to guard termination of the vm
94 extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks
95 extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm
96 extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing
97 extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread
98 extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles
99 extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates
100 extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues
102 #ifndef PRODUCT
103 extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe
104 #endif
105 extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing
106 extern Mutex* Debug2_lock; // down synchronization related bugs!
107 extern Mutex* Debug3_lock;
109 extern Mutex* RawMonitor_lock;
110 extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data
111 extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources
112 extern Mutex* ParkerFreeList_lock;
113 extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches
115 extern Mutex* MMUTracker_lock; // protects the MMU
116 // tracker data structures
117 extern Mutex* HotCardCache_lock; // protects the hot card cache
119 extern Mutex* Management_lock; // a lock used to serialize JVM management
120 extern Monitor* LowMemory_lock; // a lock used for low memory detection
122 // A MutexLocker provides mutual exclusion with respect to a given mutex
123 // for the scope which contains the locker. The lock is an OS lock, not
124 // an object lock, and the two do not interoperate. Do not use Mutex-based
125 // locks to lock on Java objects, because they will not be respected if a
126 // that object is locked using the Java locking mechanism.
127 //
128 // NOTE WELL!!
129 //
130 // See orderAccess.hpp. We assume throughout the VM that MutexLocker's
131 // and friends constructors do a fence, a lock and an acquire *in that
132 // order*. And that their destructors do a release and unlock, in *that*
133 // order. If their implementations change such that these assumptions
134 // are violated, a whole lot of code will break.
136 // Print all mutexes/monitors that are currently owned by a thread; called
137 // by fatal error handler.
138 void print_owned_locks_on_error(outputStream* st);
140 char *lock_name(Mutex *mutex);
142 class MutexLocker: StackObj {
143 private:
144 Monitor * _mutex;
145 public:
146 MutexLocker(Monitor * mutex) {
147 assert(mutex->rank() != Mutex::special,
148 "Special ranked mutex should only use MutexLockerEx");
149 _mutex = mutex;
150 _mutex->lock();
151 }
153 // Overloaded constructor passing current thread
154 MutexLocker(Monitor * mutex, Thread *thread) {
155 assert(mutex->rank() != Mutex::special,
156 "Special ranked mutex should only use MutexLockerEx");
157 _mutex = mutex;
158 _mutex->lock(thread);
159 }
161 ~MutexLocker() {
162 _mutex->unlock();
163 }
165 };
167 // for debugging: check that we're already owning this lock (or are at a safepoint)
168 #ifdef ASSERT
169 void assert_locked_or_safepoint(const Monitor * lock);
170 void assert_lock_strong(const Monitor * lock);
171 #else
172 #define assert_locked_or_safepoint(lock)
173 #define assert_lock_strong(lock)
174 #endif
176 // A MutexLockerEx behaves like a MutexLocker when its constructor is
177 // called with a Mutex. Unlike a MutexLocker, its constructor can also be
178 // called with NULL, in which case the MutexLockerEx is a no-op. There
179 // is also a corresponding MutexUnlockerEx. We want to keep the
180 // basic MutexLocker as fast as possible. MutexLockerEx can also lock
181 // without safepoint check.
183 class MutexLockerEx: public StackObj {
184 private:
185 Monitor * _mutex;
186 public:
187 MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
188 _mutex = mutex;
189 if (_mutex != NULL) {
190 assert(mutex->rank() > Mutex::special || no_safepoint_check,
191 "Mutexes with rank special or lower should not do safepoint checks");
192 if (no_safepoint_check)
193 _mutex->lock_without_safepoint_check();
194 else
195 _mutex->lock();
196 }
197 }
199 ~MutexLockerEx() {
200 if (_mutex != NULL) {
201 _mutex->unlock();
202 }
203 }
204 };
206 // A MonitorLockerEx is like a MutexLockerEx above, except it takes
207 // a possibly null Monitor, and allows wait/notify as well which are
208 // delegated to the underlying Monitor.
210 class MonitorLockerEx: public MutexLockerEx {
211 private:
212 Monitor * _monitor;
213 public:
214 MonitorLockerEx(Monitor* monitor,
215 bool no_safepoint_check = !Mutex::_no_safepoint_check_flag):
216 MutexLockerEx(monitor, no_safepoint_check),
217 _monitor(monitor) {
218 // Superclass constructor did locking
219 }
221 ~MonitorLockerEx() {
222 #ifdef ASSERT
223 if (_monitor != NULL) {
224 assert_lock_strong(_monitor);
225 }
226 #endif // ASSERT
227 // Superclass destructor will do unlocking
228 }
230 bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag,
231 long timeout = 0,
232 bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) {
233 if (_monitor != NULL) {
234 return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent);
235 }
236 return false;
237 }
239 bool notify_all() {
240 if (_monitor != NULL) {
241 return _monitor->notify_all();
242 }
243 return true;
244 }
246 bool notify() {
247 if (_monitor != NULL) {
248 return _monitor->notify();
249 }
250 return true;
251 }
252 };
256 // A GCMutexLocker is usually initialized with a mutex that is
257 // automatically acquired in order to do GC. The function that
258 // synchronizes using a GCMutexLocker may be called both during and between
259 // GC's. Thus, it must acquire the mutex if GC is not in progress, but not
260 // if GC is in progress (since the mutex is already held on its behalf.)
262 class GCMutexLocker: public StackObj {
263 private:
264 Monitor * _mutex;
265 bool _locked;
266 public:
267 GCMutexLocker(Monitor * mutex);
268 ~GCMutexLocker() { if (_locked) _mutex->unlock(); }
269 };
273 // A MutexUnlocker temporarily exits a previously
274 // entered mutex for the scope which contains the unlocker.
276 class MutexUnlocker: StackObj {
277 private:
278 Monitor * _mutex;
280 public:
281 MutexUnlocker(Monitor * mutex) {
282 _mutex = mutex;
283 _mutex->unlock();
284 }
286 ~MutexUnlocker() {
287 _mutex->lock();
288 }
289 };
291 // A MutexUnlockerEx temporarily exits a previously
292 // entered mutex for the scope which contains the unlocker.
294 class MutexUnlockerEx: StackObj {
295 private:
296 Monitor * _mutex;
297 bool _no_safepoint_check;
299 public:
300 MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
301 _mutex = mutex;
302 _no_safepoint_check = no_safepoint_check;
303 _mutex->unlock();
304 }
306 ~MutexUnlockerEx() {
307 if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) {
308 _mutex->lock_without_safepoint_check();
309 } else {
310 _mutex->lock();
311 }
312 }
313 };
315 #ifndef PRODUCT
316 //
317 // A special MutexLocker that allows:
318 // - reentrant locking
319 // - locking out of order
320 //
321 // Only too be used for verify code, where we can relaxe out dead-lock
322 // dection code a bit (unsafe, but probably ok). This code is NEVER to
323 // be included in a product version.
324 //
325 class VerifyMutexLocker: StackObj {
326 private:
327 Monitor * _mutex;
328 bool _reentrant;
329 public:
330 VerifyMutexLocker(Monitor * mutex) {
331 _mutex = mutex;
332 _reentrant = mutex->owned_by_self();
333 if (!_reentrant) {
334 // We temp. diable strict safepoint checking, while we require the lock
335 FlagSetting fs(StrictSafepointChecks, false);
336 _mutex->lock();
337 }
338 }
340 ~VerifyMutexLocker() {
341 if (!_reentrant) {
342 _mutex->unlock();
343 }
344 }
345 };
347 #endif